Companies using Microsoft 365 Defender

As of 14 October 2026, Firmable tracks 15 companies across 13 countries running Microsoft 365 Defender. See who they are, and who to call.

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Companies using Microsoft 365 Defender

Country Industry

Showing 2 of 15 companies

Quorum Cyber

quorumcyber.com · Cybersecurity · 251–500 employees

Last seen 13 Aug 2026

Decision makers · 22 on file

Chief Executive Officer MobileEmail

General Counsel MobileEmail

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Signals

Hired as Chief People Officer · 28 Aug 2026

Livingbridge invests into Quorum Cyber in investment. · 28 Aug 2026

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YODA TECH

yoda-tech.com · Cybersecurity · 251–500 employees

Last seen 21 Jul 2026

Decision makers · 10 on file

Information Technology Service Delivery Manager MobileEmail

Chief Executive Officer MobileEmail

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Signals

No signals recorded

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Who uses Microsoft 365 Defender

A breakdown of the 15 companies running Microsoft 365 Defender.

Top industries

Information technology and services15

Company size

1–103 (23%)

11–503 (23%)

51–2504 (31%)

251–5002 (15%)

10,001+1 (8%)

Share of companies with a recorded size, by employees.

No size recorded: 2

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Frequently asked questions

About the Microsoft 365 Defender data on this page.

How many companies use Microsoft 365 Defender?

Firmable holds confirmed Microsoft 365 Defender detections for 15 distinct companies, 8 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.

Which companies use Microsoft 365 Defender?

Quorum Cyber and YODA TECH are among the most prominent in the current set.

What industries use Microsoft 365 Defender?

Information technology and services lead the set, across 2 industries in total.

What size companies use Microsoft 365 Defender?

Adoption concentrates in the 51-250 employee band, across the companies whose size is recorded.

Where are Microsoft 365 Defender users based?

The United States, Australia, Canada and Malaysia account for most detections, across 13 countries.

How current is this data?

8 companies were confirmed in the last 90 days. Last detection 20 September 2026.

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